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Old 01-22-2013, 04:13 PM   #36
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Join Date: Dec 2006
Location: Bedford,Massachusetts,US
Posts: 3,238
Default It is incorrect

Originally Posted by toly View Post
The speed maybe doesn't go down but acceleration usually does, see
It is incorrect
1.The head racket speed decreases AFTER the contact
(when speed means the length of a three dimensional vector)
2.The acceleration is changing the sign at the contact
i.e it is POSITIVE before the contact and NEGATIVE after the contact
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